“Botulinum Toxin-A in the Treatment of Upper Facial Wrinkles: Efficacy Comparison of Different Formulations”. Annals of Medical Research 30, no. 10 (October 25, 2023): 1347–1352. Accessed April 26, 2025. http://www.annalsmedres.org/index.php/aomr/article/view/4555.